The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/xen/evtchn/evtchnvar.h

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    1 /******************************************************************************
    2  * evtchn.h
    3  * 
    4  * Data structures and definitions private to the FreeBSD implementation
    5  * of the Xen event channel API.
    6  * 
    7  * Copyright (c) 2004, K A Fraser
    8  * Copyright (c) 2012, Spectra Logic Corporation
    9  *
   10  * This file may be distributed separately from the Linux kernel, or
   11  * incorporated into other software packages, subject to the following license:
   12  *
   13  * Permission is hereby granted, free of charge, to any person obtaining a copy
   14  * of this source file (the "Software"), to deal in the Software without
   15  * restriction, including without limitation the rights to use, copy, modify,
   16  * merge, publish, distribute, sublicense, and/or sell copies of the Software,
   17  * and to permit persons to whom the Software is furnished to do so, subject to
   18  * the following conditions:
   19  * 
   20  * The above copyright notice and this permission notice shall be included in
   21  * all copies or substantial portions of the Software.
   22  * 
   23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   24  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   25  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   26  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   27  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   28  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
   29  * IN THE SOFTWARE.
   30  *
   31  * $FreeBSD: releng/10.4/sys/xen/evtchn/evtchnvar.h 255040 2013-08-29 19:52:18Z gibbs $
   32  */
   33 
   34 #ifndef __XEN_EVTCHN_EVTCHNVAR_H__
   35 #define __XEN_EVTCHN_EVTCHNVAR_H__
   36 
   37 #include <xen/hypervisor.h>
   38 #include <xen/interface/event_channel.h>
   39 
   40 enum evtchn_type {
   41         EVTCHN_TYPE_UNBOUND,
   42         EVTCHN_TYPE_PIRQ,
   43         EVTCHN_TYPE_VIRQ,
   44         EVTCHN_TYPE_IPI,
   45         EVTCHN_TYPE_PORT,
   46         EVTCHN_TYPE_COUNT
   47 };
   48 
   49 /** Submit a port notification for delivery to a userland evtchn consumer */
   50 void evtchn_device_upcall(evtchn_port_t port);
   51 
   52 /**
   53  * Disable signal delivery for an event channel port, returning its
   54  * previous mask state.
   55  *
   56  * \param port  The event channel port to query and mask.
   57  *
   58  * \returns  1 if event delivery was previously disabled.  Otherwise 0.
   59  */
   60 static inline int
   61 evtchn_test_and_set_mask(evtchn_port_t port)
   62 {
   63         shared_info_t *s = HYPERVISOR_shared_info;
   64         return synch_test_and_set_bit(port, s->evtchn_mask);
   65 }
   66 
   67 /**
   68  * Clear any pending event for the given event channel port.
   69  *
   70  * \param port  The event channel port to clear.
   71  */
   72 static inline void 
   73 evtchn_clear_port(evtchn_port_t port)
   74 {
   75         shared_info_t *s = HYPERVISOR_shared_info;
   76         synch_clear_bit(port, &s->evtchn_pending[0]);
   77 }
   78 
   79 /**
   80  * Disable signal delivery for an event channel port.
   81  *
   82  * \param port  The event channel port to mask.
   83  */
   84 static inline void
   85 evtchn_mask_port(evtchn_port_t port)
   86 {
   87         shared_info_t *s = HYPERVISOR_shared_info;
   88 
   89         synch_set_bit(port, &s->evtchn_mask[0]);
   90 }
   91 
   92 /**
   93  * Enable signal delivery for an event channel port.
   94  *
   95  * \param port  The event channel port to enable.
   96  */
   97 static inline void
   98 evtchn_unmask_port(evtchn_port_t port)
   99 {
  100         evtchn_unmask_t op = { .port = port };
  101 
  102         HYPERVISOR_event_channel_op(EVTCHNOP_unmask, &op);
  103 }
  104 
  105 #endif /* __XEN_EVTCHN_EVTCHNVAR_H__ */

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